HawkEye 360 CEO John Sheldon Serafini sells 92,329 shares

The shares exercised and sold were pursuant to a Rule 10b5-1 plan adopted on May 21, 2026.

Rhea-AI Filing Summary

HawkEye 360, Inc. (HAWK) President and CEO John Sheldon Serafini exercised fully vested options for 92,329 common shares at $0.23 per share on October 1, 2026, then sold 92,329 shares at a weighted average $14.784 per share; sale prices ranged from $14.59 to $15.14. The shares exercised and sold were pursuant to a Rule 10b5-1 Plan adopted on May 21, 2026. The derivative transaction reports 140,943 options following the exercise. Separately, the Serafini Holding Trust held 4,545 common shares, and Serafini had voting and dispositive power as trustee.

Insider Trade Summary 10b5-1

Exercise and Sale: 92,329 shares ($1.34M approx. pre-tax spread)

Exercise and Sale 4 txns

Insider Serafini John Sheldon

Role President and CEO

Sold 92,329 shs ($1.36M)

Approx. gross sale proceeds $1.36M

Approx. exercise cost $21K

Approx. pre-tax spread $1.34M

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy) F4	92,329	$0.23	$21K
Exercise	Common Stock F1	92,329	$0.23	$21K
Sale	Common Stock F1, F2	92,329	$14.784	$1.36M
holding	Common Stock F3	--	--	--

Holdings After Transaction: Stock Option (Right to Buy) — 140,943 contracts (Direct); Common Stock — 554,972 shares (Direct); Common Stock — 4,545 shares (Indirect, See footnote)

Footnotes (4)

1. F1. Represents shares exercised and sold pursuant to a Rule 10b5-1 Plan adopted on May 21, 2026.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.59 to $15.14 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold each separate price within the range set forth in this footnote.
3. F3. The shares are held by the Serafini Holding Trust Dated June 8, 2018, of which the Reporting Person is trustee and has voting and dispositive power.
4. F4. Fully vested.

Key Figures

Options exercised: 92,329 shares Option exercise price: $0.23 per share Common shares sold: 92,329 shares +4 more

7 metrics

Options exercised 92,329 shares October 1, 2026; fully vested

Option exercise price $0.23 per share Options exercised on October 1, 2026

Common shares sold 92,329 shares October 1, 2026

Weighted average sale price $14.784 per share Sale on October 1, 2026

Sale price range $14.59 to $15.14 per share Inclusive range for the October 1, 2026 sale

Options following exercise 140,943 shares Reported following the October 1, 2026 exercise

Trust-held common shares 4,545 shares Held by the Serafini Holding Trust; Serafini was trustee with voting and dispositive power

Key Terms

Rule 10b5-1 Plan, weighted average price, Fully vested, Stock Option (Right to Buy)

4 terms

Rule 10b5-1 Plan regulatory

"pursuant to a Rule 10b5-1 Plan adopted on May 21, 2026"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Fully vested financial

"Fully vested"

Stock Option (Right to Buy) financial

"Stock Option (Right to Buy)"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many HAWK shares did John Sheldon Serafini sell?

John Sheldon Serafini sold 92,329 common shares on October 1, 2026, at a weighted average $14.784 per share; individual sale prices ranged from $14.59 to $15.14. The shares exercised and sold were pursuant to a Rule 10b5-1 Plan adopted on May 21, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/02/2026 - 04:17 PM Accepted by SEC EDGAR 10/02/2026 - 04:17 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Serafini John Sheldon

(Last) (First) (Middle)

C/O HAWKEYE 360, INC.

450 SPRINGPARK PLACE, SUITE 500

(Street)

HERNDON VIRGINIA 20170

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
HawkEye 360, Inc. [ HAWK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/01/2026		M(1)		92,329	A	$0.23	647,301	D
Common Stock	10/01/2026		S(1)		92,329	D	$14.784(2)	554,972	D
Common Stock								4,545	I	See footnote(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$0.23	10/01/2026		M			92,329	(4)	02/08/2027	Common Stock	92,329	$0.23	140,943	D

Explanation of Responses:

1. Represents shares exercised and sold pursuant to a Rule 10b5-1 Plan adopted on May 21, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.59 to $15.14 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold each separate price within the range set forth in this footnote.

3. The shares are held by the Serafini Holding Trust Dated June 8, 2018, of which the Reporting Person is trustee and has voting and dispositive power.

4. Fully vested.

	/s/ Michael S. Turner, Attorney-in-Fact	10/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)